[openstack-dev] Scheduler proposal

Thomas Goirand zigo at debian.org
Sat Oct 10 21:05:59 UTC 2015

On 10/07/2015 07:36 PM, Ed Leafe wrote:
> Several months ago I proposed an experiment [0] to see if switching
> the data model for the Nova scheduler to use Cassandra as the backend
> would be a significant improvement as opposed to the current design

This is probably right. I don't know, I'm not an expert in Nova, or its
scheduler. However, to make it possible for us (ie: downstream
distributions and/or OpenStack users) to use Cassandra, you have to
solve one of the below issues:

1/ Cassandra developers upstream should start caring about OpenJDK, and
make sure that it is also a good platform for it. They should stop
caring only about the Oracle JVM.

... or ...

2/ Oracle should make its JVM free software.

As there is no hope for any of the above, Cassandra is a no-go for
downstream distributions.

So, by all means, propose a new back-end, implement it, profit. But that
back-end cannot be Cassandra the way it is now.


Thomas Goirand (zigo)

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